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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Validation of the SCEC Broadband Platform simulations for tall building risk assessments considering spectral shape and duration of the ground motion
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Validation of the SCEC Broadband Platform simulations for tall building risk assessments considering spectral shape and duration of the ground motion

机译：考虑地面运动的频谱形状和持续时间的SCEC宽带平台模拟的验证，可用于高层建筑风险评估

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Earthquake simulation technologies are advancing to the stage of enabling realistic simulations of past earthquakes as well as characterizations of more extreme events, thus holding promise of yielding novel insights and data for earthquake engineering. With the goal of developing confidence in the engineering applications of simulated ground motions, this paper focuses on validation of simulations for response history analysis through comparative assessments of building performance obtained using sets of recorded and simulated motions. Simulated ground motions of past earthquakes, obtained through a larger validation study of the Southern California Earthquake Center Broadband Platform, are used for the case study. Two tall buildings, a 20-story concrete frame and a 42-story concrete core wall building, are analyzed under comparable sets of simulated and recorded motions at increasing levels of ground motion intensity, up to structural collapse, to check for statistically significant differences between the responses to simulated and recorded motions. Spectral shape and significant duration are explicitly considered when selecting ground motions. Considered demands include story drift ratios, floor accelerations, and collapse response. These comparisons not only yield similar results in most cases but also reveal instances where certain simulated ground motions can result in biased responses. The source of bias is traced to differences in correlations of spectral values in some of the stochastic ground motion simulations. When the differences in correlations are removed, simulated and recorded motions yield comparable results. This study highlights the utility of physics-based simulations, and particularly the Southern California Earthquake Center Broadband Platform as a useful tool for engineering applications.
机译：地震模拟技术正在发展到能够对过去的地震进行真实模拟以及对更多极端事件进行表征的阶段，从而有望为地震工程学提供新颖的见解和数据。为了发展对模拟地面运动的工程应用的信心，本文着重于通过对使用记录和模拟运动集获得的建筑性能进行比较评估，对用于响应历史分析的模拟进行验证。通过对南加州地震中心宽带平台的大型验证研究获得的过去地震的模拟地面运动用于案例研究。在可比较的模拟运动和记录运动下，对两座高层建筑（一个20层的混凝土框架和一个42层的混凝土核心墙建筑物）进行了模拟和记录的相似运动，并分析了它们在地面运动强度增加到结构坍塌的水平，并检查了两者之间的统计学差异。对模拟运动和录制运动的响应。选择地面运动时，应明确考虑频谱形状和持续时间。考虑的需求包括楼层漂移率，地板加速度和倒塌响应。这些比较不仅在大多数情况下产生相似的结果，而且还揭示了某些模拟地面运动可能导致响应偏差的情况。在某些随机地震动模拟中，偏差的来源可追溯到频谱值相关性的差异。消除相关性差异后，模拟和记录的运动会产生可比较的结果。这项研究强调了基于物理的仿真的实用性，特别是南加州地震中心宽带平台作为工程应用的有用工具。

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